218 N. H. AGR. EXPERIMENT STATION. [Bulletin 139 



same color along the hinder margin. The hind-wings of the 

 male are brownish, of the female dusky brown ; the body is light 

 brown, the thorax of a darker shade. With wings expanded they 

 measure an inch and a quarter across." 



Eggs. — The eggs are similar to those of the Yellow-necked 

 Apple Caterpillar, being laid on the under side of a leaf, and 

 are shown in figure 7, a. Eggs are laid from late June or early 

 July until September 1st. But one brood occurs in a season. 



REMEDIES. 



As the. work of these caterpillars is very quickly noticed and 

 as they habitually feed together in colonies, it is an easy matter 

 to hand pick and destroy them, or swab them off the limbs with 

 a rag or waste saturated with kerosene. When a colony is no- 

 ticed at the tip of a limb it may be cut off and burned, though 

 this is rarely necessary. If this and other caterpillars are com- 

 mon upon the terminals it will be well to spray the trees about 

 August 1st with arsenate of lead, three to five pounds per barrel. 

 To be most effective this should be applied while the caterpillars 

 are still small. (See page 225 concerning spraying.) 



THE HICKORY TIGER MOTH.* 



Thougli usually common upon hickory, walnut and butternut, 

 for the past few seasons this caterpillar has been numerous in 

 apple orchards. It also often attacks elm, ash, and linden, and 

 willow. Clusters of partly grown caterpillars were found feed- 

 ing upon the under sides of the leaves early in August. 



Larvae. — The caterpillars become full grown during the latter 

 half of September, when they are about l^/^ inches long. The 

 young caterpillars resemble the grown ones in coloration and are 

 striking insects with their tufts of white and black hairs. The 

 caterpillars are white with a row of eight black tufts along the 

 back, two black, pencil-like tufts on the fourth and tenth seg- 

 ments; four white tufts on the second and third, and two on the 

 eleventh and twelfth. The head, forelegs, and the surface of the 

 body are covered with minute black tubercles and there is a 

 transverse black line between each segment. (See figure 8.) 



* Halisidota earyae Harris. 



